Deprecate pagestrategy directory and antieframework.php

Page strategy files now live in a separate repository:
https://github.com/fmtvp/tal-page-strategies

This release deprecates both the pagestrategies directory, and the PHP file that uses them, php/antieframework.php. At the same time, the NodeJS version of the bootstrapping file - node/antieframework.js - has been modified to use the page strategies repository as an NPM module.

Users should migrate to using the new page strategies location before the next major release, using either the NPM approach or a mechanism of their choosing.

The tutorial documentation (http://fmtvp.github.io/tal/getting-started/tutorial/installation.html) has been updated accordingly.